Rough piece of carbon rock mineral in the form of graphite, an allotrope of carbon, known for its use in pencils

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Photo credit: © Anyka / Alamy / Afripics
License: Royalty Free
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Keywords: beautiful, black, carbon, chemical, closeup, color, crystal, crystalline, crystals, detail, geology, graphite, grey, isolated, macro, mineral, mineralogy, minerals, natural, pencil, pencils, rock, rocks, rough, specimen, stone, structure, treasure, uncut, unpolished, valuable